A Journal of Natural Philosophy, Chemistry and the Arts, Bände 17-18

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Seite 100 - It has been said that he who makes two blades of grass grow where only one grew before is a benefactor to his species.
Seite 142 - ... dried over the fire in an iron pot, in the proportion of two parts of lime and one of glass, till the mixture becomes of the consistence of thin plaster. The cement must be used immediately after being mixed, and therefore it is proper not to mix more of it...
Seite 323 - Mr. Sylvester, however, in a Paper published in Mr. Nicholson's Journal for last August, states, that .though no fixed alkali or muriatic acid appears when a single vessel is employed ; yet that they are both formed when two vessels are used. And to do away all objections with regard to vegetable substances or glass, he conducted his process in a vessel made of baked tobacco-pipe clay inserted in a crucible of platina. I have no doubt of the correctness of his results : but the conclusion appears...
Seite 102 - ... soil. Then divide the ground into beds, four feet wide, with alleys of eighteen inches, after which, at the distance of every two feet each way, sow five or six seeds two inches deep, in a circle of about four inches diameter...
Seite 321 - ... in much obscurity. An attempt to elucidate the subject will not, I hope, be considered by the Society as unfitted to the design of the Bakerian Lecture. I shall have to detail some minute (and I fear tedious) experiments; but they were absolutely essential to the investigation. I shall likewise, however, be able to offer some illustrations of appearances which hitherto have not been fully explained, and to point out some new properties of one of the most powerful and general of material agents....
Seite 191 - ... inactive. The Crab is a native of both countries, and has adapted alike its habits to both ; the Siberian variety introduced into the climate of England, retains its habits, expands its leaves, and blossoms on the first approach of spring, and vegetates strongly in the same temperature in which the native Crab scarcely shows signs of life; and its fruit acquires a degree of maturity, even in the early part of an unfavourable season, which our native Crab is rarely, or never seen to attain.
Seite 238 - I observed two magpies hopping round a gooseberry bush, in a small garden, near a poor-looking house, in a peculiar manner, and flying out and into the bush. I stepped aside to see what they were doing, and found, from the poor man and his wife, that as there are no trees all...
Seite 326 - ... a slight blue tint to litmus paper: and the water in the positive tube rendered it red. The process was continued for 14 hours; the acid increased in quantity during the whole time, and the water became at last very sour to the taste. The alkaline properties of the fluid in the other tube, on the contrary, remained stationary, and at the end of the time, it did not act upon litmus or turmeric paper more than in the first trial: the effect was less vivid after it had been strongly heated for a...
Seite 187 - Hounslow; it grew, and produced strong plants, which ripened their seeds : those seeds vegetated in the succeeding spring, but the plants they produced were weak, slender, not half so tall as those of the first generation, and grew in the shallowest water only ; the seeds of these plants produced others the next year, sensibly stronger than their parents of the second year. In this manner the plants proceeded, springing up every year from the seeds of the preceding one, every year becoming visibly...
Seite 190 - Nile, each would adapt its habits to the climate in which it were placed ; and if both were subsequently brought, in early spring, into a climate similar to that of Italy, the plant which had adapted its habits to a cold climate would instantly vegetate, whilst the other would remain perfectly torpid.

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